# Delaware, New Jersey, and Pennsylvania-    Determinations of Attainment of the 1997 Annual PM2.5 National Ambient Air Quality Standard for the Philadelphia-Wilmington Nonattainment Area

> **EPA** · Rulemaking · Modified 2026-01-22T16:04:39Z

## Docket
- **Docket ID:** EPA-R03-OAR-2011-0714
- **Agency:** EPA
- **Type:** Rulemaking
- **Last modified:** 2026-01-22T16:04:39Z

## Source
- [regulations.gov docket](https://www.regulations.gov/docket/EPA-R03-OAR-2011-0714)
- [Public comments](https://www.regulations.gov/docket/EPA-R03-OAR-2011-0714/comments)

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